2 The leaders of all the people of the tribes of Israel took their places in the assembly of God’s people, four hundred thousand men armed with swords.

Read Judges 20:2 Using Other Translations

And the chief of all the people, even of all the tribes of Israel, presented themselves in the assembly of the people of God, four hundred thousand footmen that drew sword.
And the chiefs of all the people, of all the tribes of Israel, presented themselves in the assembly of the people of God, 400,000 men on foot that drew the sword.
The leaders of all the people and all the tribes of Israel—400,000 warriors armed with swords—took their positions in the assembly of the people of God.